On the highway today my over drive light started flashing. After I got off the highway I pressed the O/D button and it didn’t stop flashing but over drive did turn off. Once I got to work I turned the car off and back on and the light worked as it should. Before this over the past few weeks I noticed that sometimes I could turn O/D off but it wouldn’t re-engage after pressing the button again even though the light would go out. I would then have to put the transmission in neutral then back into drive to get O/D to engage. What’s going on??? FYI I don’t have the stock shifter I have a B&M Hammer shifter.